EVANS Cooling Systems EC42001 Waterless Prep Fluid, 128 fl. oz. with Funnel Engineered specifically to purge the cooling system before installing new waterless coolant Seeks out old coolant and water that remain after draining existing antifreeze/water mixture from an engine Especially important to use when block drains are unavailable or cannot be removed Ensures that the final water content after installing Evans Waterless Coolant meets operating limits Protects cooling system metals during flush, but is not a substitute for Evans Waterless Coolants Comes with funnel for easy pouring, color may vary.